Dinosaur teeth have ancient air trapped inside of them

Today's advice for America's founding fathers

Newly renovated Reflecting Pool turns green

Timelapse: '86 47' appears on National Mall

War in Ukraine officially longer than World War I

How Trump influences Israeli opinion, elections

How Iranians find new ways to resist in dark moments

WATCH: Trump pressed on convincing U.S that Iran deal is a victory

Slavery is both “nowhere” and “everywhere” in the Constitution

Anti-immigrant protests in Northern Ireland turn violent

UK announces social media ban for teens under 16

Anti-Trump '8647' message appears on National Mall

Octagon at White House ready for Trump's UFC fight

Pope Leo blesses Barcelona's Sagrada Familia Basilica

Bruce Springsteen's museum dedicated to American music

WATCH: Historic cathedral in Kyiv burns after Russian strikes

Interfaith group considers religion in America's founding

WATCH: Tensions increase as 'true scale' of Ebola remains unknown